摘要
斯特罗哈数的雷诺数效应是桥梁断面雷诺数效应研究中的一个重要问题.表面压力积分成气动力的方法在文中得到了应用,用这种方法不仅得到了气动力均值,更重要的是获得了气动力的时程,从而可以计算气动力的RMS值和频率.通过压力积分气动力主要频率计算出刚性支撑断面的斯特罗哈数,并研究了斯特罗哈数随雷诺数的变化规律.试验雷诺数范围为2.7×10^4～1.4×10^6,其中高雷诺数与实桥仅差一个数量级,能够反映实桥情况.在研究中发现扁平桥梁箱形断面的斯特罗哈数有明显的雷诺数效应,斯特罗哈数变化的过渡区雷诺数范围在2×10^5～4×10^5.
Reynolds number effects on Strouhal number are very important in the study on Reynolds number of bridge decks. The method to obtain aerodynamic forces by spatial integration of the surface pressures is used. With it both the mean values of net aerodynamic forces and their time histories can be obtained. The RMS value and the frequency of aerodynamic forces can then be evaluated. The Strouhal numbers of the stationary section are calculated from the peak frequency of the net aerodynamic forces, and the Reynolds number effects on Strouhal number are investigated. A wide range of 2.7× 10^4 to 1.4× 10^6 based on the deck heights are investigated, in which the larger one is only one magnitude less than the full-scale. It is found that the Strouhal number of fiat-box girder bridge deck is affected by Reynolds number effects, and the Reynolds number in the transition region is from 2×10^5 to 4× 10^5.
出处
《工程力学》
EI
CSCD
北大核心
2006年第10期174-179,共6页
Engineering Mechanics
基金
国家自然科学基金重大项目资助(59895410)
关键词
风洞试验
雷诺数效应
表面压力积分
扁平箱形桥梁断面
斯特罗哈数
wind tunnel test
Reynolds number effects
integration of the surface pressures
flat-box girder bridge deck
Strouhal number
